it does the following
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disables animations
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hides cosmetic post awards
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make the emoji search execute only when u press "Enter" instead of executing everytime u type a character
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hides signatures
you can enable it here https://rdrama.net/settings/content 
and you can see a list of ppl who enabled it here https://rdrama.net/poorcels 
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There are better solutions to this. Even if you dont want a final solution, you could switch from js animations to css animations. They lag less because css was made for animations and js wasnt
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